package org.jcodec.algo;

import org.jcodec.common.AudioFormat;

/**
 * This class is part of JCodec ( www.jcodec.org ) This software is distributed
 * under FreeBSD License
 * 
 * @author The JCodec project
 * 
 */
public class SoundFilter {

    public static final int[] sine = new int[] { 0, 1, 3, 4, 6, 7, 9, 10, 12, 14, 15, 17, 18, 20, 21, 23, 25, 26, 28,
            29, 31, 32, 34, 36, 37, 39, 40, 42, 43, 45, 47, 48, 50, 51, 53, 54, 56, 57, 59, 61, 62, 64, 65, 67, 68, 70,
            72, 73, 75, 76, 78, 79, 81, 82, 84, 85, 87, 89, 90, 92, 93, 95, 96, 98, 99, 101, 102, 104, 106, 107, 109,
            110, 112, 113, 115, 116, 118, 119, 121, 122, 124, 125, 127, 128, 130, 132, 133, 135, 136, 138, 139, 141,
            142, 144, 145, 147, 148, 150, 151, 153, 154, 156, 157, 159, 160, 162, 163, 165, 166, 168, 169, 171, 172,
            173, 175, 176, 178, 179, 181, 182, 184, 185, 187, 188, 190, 191, 193, 194, 195, 197, 198, 200, 201, 203,
            204, 206, 207, 208, 210, 211, 213, 214, 216, 217, 218, 220, 221, 223, 224, 225, 227, 228, 230, 231, 233,
            234, 235, 237, 238, 239, 241, 242, 244, 245, 246, 248, 249, 250, 252, 253, 255, 256, 257, 259, 260, 261,
            263, 264, 265, 267, 268, 269, 271, 272, 273, 275, 276, 277, 279, 280, 281, 283, 284, 285, 287, 288, 289,
            290, 292, 293, 294, 296, 297, 298, 299, 301, 302, 303, 304, 306, 307, 308, 310, 311, 312, 313, 314, 316,
            317, 318, 319, 321, 322, 323, 324, 326, 327, 328, 329, 330, 332, 333, 334, 335, 336, 337, 339, 340, 341,
            342, 343, 345, 346, 347, 348, 349, 350, 351, 353, 354, 355, 356, 357, 358, 359, 360, 362, 363, 364, 365,
            366, 367, 368, 369, 370, 371, 372, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387,
            388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408,
            409, 410, 411, 412, 413, 414, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 423, 424, 425, 426, 427,
            428, 429, 430, 430, 431, 432, 433, 434, 435, 435, 436, 437, 438, 439, 439, 440, 441, 442, 443, 443, 444,
            445, 446, 447, 447, 448, 449, 450, 450, 451, 452, 453, 453, 454, 455, 455, 456, 457, 458, 458, 459, 460,
            460, 461, 462, 462, 463, 464, 464, 465, 466, 466, 467, 468, 468, 469, 469, 470, 471, 471, 472, 473, 473,
            474, 474, 475, 475, 476, 477, 477, 478, 478, 479, 479, 480, 481, 481, 482, 482, 483, 483, 484, 484, 485,
            485, 486, 486, 487, 487, 488, 488, 489, 489, 489, 490, 490, 491, 491, 492, 492, 493, 493, 493, 494, 494,
            495, 495, 495, 496, 496, 497, 497, 497, 498, 498, 498, 499, 499, 499, 500, 500, 500, 501, 501, 501, 502,
            502, 502, 503, 503, 503, 503, 504, 504, 504, 504, 505, 505, 505, 505, 506, 506, 506, 506, 507, 507, 507,
            507, 507, 508, 508, 508, 508, 508, 509, 509, 509, 509, 509, 509, 509, 510, 510, 510, 510, 510, 510, 510,
            510, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511, 511 };

    public static final int[] linear = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
            19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
            46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
            73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
            100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120,
            121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141,
            142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162,
            163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183,
            184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204,
            205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225,
            226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246,
            247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267,
            268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288,
            289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309,
            310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330,
            331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351,
            352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372,
            373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393,
            394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414,
            415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435,
            436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456,
            457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477,
            478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498,
            499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511 };

    public static void in16BitSignedLE(byte[] b, int nCh, int[] func) {
        int to = Math.min(b.length * nCh * 2, func.length);
        int off = 0;
        for (int i = 0; i < to; i++) {
            for (int j = 0; j < nCh; j++) {
                short sample = (short) ((b[off] & 0xff) | ((b[off + 1] & 0xff) << 8));
                sample = (short) ((sample * func[i]) >> 9);
                b[off] = (byte) (sample & 0xff);
                b[off + 1] = (byte) (sample >> 8);
                off += 2;
            }
        }
    }

    public static void out16BitSignedLE(byte[] b, int nCh, int[] func) {
        int to = Math.min(b.length * nCh * 2, func.length);
        int off = b.length - (to * nCh * 2);
        for (int i = 0; i < to; i++) {
            for (int j = 0; j < nCh; j++) {
                short sample = (short) ((b[off] & 0xff) | ((b[off + 1] & 0xff) << 8));
                sample = (short) ((sample * func[512 - i - 1]) >> 9);
                b[off] = (byte) (sample & 0xff);
                b[off + 1] = (byte) (sample >> 8);
                off += 2;
            }
        }
    }

    public static void _in(AudioFormat fmt, byte[] samples, int[] func) {
        in16BitSignedLE(samples, fmt.getChannels(), func);
    }

    public static void out(AudioFormat fmt, byte[] samples, int[] func) {
        out16BitSignedLE(samples, fmt.getChannels(), func);
    }
}
